/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.camera.settings;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.hardware.Camera;
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import android.os.Build;
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import android.preference.PreferenceManager;
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import com.android.camera.util.Size;
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import com.google.common.base.Optional;
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import java.util.List;
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/**
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* Facilitates caching of camera supported picture sizes, which is slow
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* to query. Will update cache if Build ID changes.
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*/
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public class CameraPictureSizesCacher {
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private static final String PICTURE_SIZES_BUILD_KEY = "CachedSupportedPictureSizes_Build_Camera";
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private static final String PICTURE_SIZES_SIZES_KEY = "CachedSupportedPictureSizes_Sizes_Camera";
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/**
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* Opportunistically update the picture sizes cache, if needed.
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*
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* @param cameraId cameraID we have sizes for.
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* @param sizes List of valid sizes.
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*/
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public static void updateSizesForCamera(Context context, int cameraId, List<Size> sizes) {
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String key_build = PICTURE_SIZES_BUILD_KEY + cameraId;
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SharedPreferences defaultPrefs = PreferenceManager.getDefaultSharedPreferences(context);
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String thisCameraCachedBuild = defaultPrefs.getString(key_build, null);
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// Write to cache.
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if (thisCameraCachedBuild == null) {
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String key_sizes = PICTURE_SIZES_SIZES_KEY + cameraId;
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SharedPreferences.Editor editor = defaultPrefs.edit();
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editor.putString(key_build, Build.DISPLAY);
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editor.putString(key_sizes, Size.listToString(sizes));
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editor.apply();
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}
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}
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/**
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* Return list of Sizes for provided cameraId. Check first to see if we
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* have it in the cache for the current android.os.Build.
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* Note: This method calls Camera.open(), so the camera must be closed
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* before calling or null will be returned if sizes were not previously
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* cached.
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*
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* @param cameraId cameraID we would like sizes for.
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* @param context valid android application context.
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* @return List of valid sizes, or null if the Camera can not be opened.
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*/
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public static List<Size> getSizesForCamera(int cameraId, Context context) {
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Optional<List<Size>> cachedSizes = getCachedSizesForCamera(cameraId, context);
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if (cachedSizes.isPresent()) {
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return cachedSizes.get();
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}
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// No cached value, so need to query Camera API.
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Camera thisCamera;
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try {
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thisCamera = Camera.open(cameraId);
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} catch (RuntimeException e) {
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// Camera open will fail if already open.
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return null;
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}
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if (thisCamera != null) {
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String key_build = PICTURE_SIZES_BUILD_KEY + cameraId;
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String key_sizes = PICTURE_SIZES_SIZES_KEY + cameraId;
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SharedPreferences defaultPrefs = PreferenceManager.getDefaultSharedPreferences(context);
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List<Size> sizes = Size.buildListFromCameraSizes(thisCamera.getParameters()
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.getSupportedPictureSizes());
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thisCamera.release();
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SharedPreferences.Editor editor = defaultPrefs.edit();
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editor.putString(key_build, Build.DISPLAY);
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editor.putString(key_sizes, Size.listToString(sizes));
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editor.apply();
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return sizes;
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}
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return null;
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}
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/**
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* Returns the cached sizes for the current camera. See
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* {@link #getSizesForCamera} for details.
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*
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* @param cameraId cameraID we would like sizes for.
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* @param context valid android application context.
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* @return Optional ist of valid sizes. Not present if the sizes for the
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* given camera were not cached.
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*/
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public static Optional<List<Size>> getCachedSizesForCamera(int cameraId, Context context) {
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String key_build = PICTURE_SIZES_BUILD_KEY + cameraId;
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String key_sizes = PICTURE_SIZES_SIZES_KEY + cameraId;
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SharedPreferences defaultPrefs = PreferenceManager.getDefaultSharedPreferences(context);
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// Return cached value for cameraId and current build, if available.
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String thisCameraCachedBuild = defaultPrefs.getString(key_build, null);
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if (thisCameraCachedBuild != null && thisCameraCachedBuild.equals(Build.DISPLAY)) {
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String thisCameraCachedSizeList = defaultPrefs.getString(key_sizes, null);
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if (thisCameraCachedSizeList != null) {
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return Optional.of(Size.stringToList(thisCameraCachedSizeList));
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}
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}
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return Optional.absent();
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}
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}
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